391200028 has 6 divisors (see below), whose sum is σ = 684600056. Its totient is φ = 195600012.

The previous prime is 391200023. The next prime is 391200037. The reversal of 391200028 is 820002193.

It is a junction number, because it is equal to n+sod(n) for n = 391199975 and 391200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391200023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48900000 + ... + 48900007.

Almost surely, 2^391200028 is an apocalyptic number.

It is an amenable number.

391200028 is a deficient number, since it is larger than the sum of its proper divisors (293400028).

391200028 is a wasteful number, since it uses less digits than its factorization.

391200028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97800011 (or 97800009 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 391200028 is about 19778.7772119512. Note that the first 3 decimals coincide. The cubic root of 391200028 is about 731.3629556632.

The spelling of 391200028 in words is "three hundred ninety-one million, two hundred thousand, twenty-eight".